5 simple

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160m Band Loaded Inverted L Antenna - This is a simple 160 meters antenna, a short loaded inverted L. The linear lenght is 20 meters, with the loading coil at 5 meters from the feedpoint.
[ Hits: 320 | Votes: 1 | Rating: 7 ]

A Simple High-Performance Vertical Antenna - This article describes the details of the design, which can be easily scaled for just about any HF band. The antenna described in this article is for the 20 meters band.
[ Hits: 667 | Votes: 3 | Rating: 9.67 ]

Linear Loaded 40m Dipole - Dipole for 40m band. It is a simple linear loaded dipole feeded with 450-Ohm openwire feedline. Designed it for resonance at 7.050 MHz, can be tuned on 30m and 80m bands with an external antenna tuner. Build with simple electrical copper wire (2.5 mmq/13 awg) and two fishing poles with size of about 7 m/23 ft.
[ Hits: 162 | Votes: 0 | Rating: 0 ]

6 metre SOTA Antenna - A simple and light vertical coaxial dipole for 50-52 MHz band, designed for portable SOTA operations based and inspired by the VK2ZOI flower pot antenna
[ Hits: 166 | Votes: 0 | Rating: 0 ]
Halo and Stub antenna for 50MHz and 70MHz - Omni-directional mixed polarisation antenna for 50MHz & 70MHz. This is a simple Halo and Stub antenna which provides an omni-directional radiation pattern with mixed polarisation, which I built for use with the SUWS WEB SDR
[ Hits: 137 | Votes: 1 | Rating: 9 ]

Choking balun for 160-30 meter band - Choking balun for lower HF and MF bands. (1.8MHz - 10MHz). Requiring a choking balun to isolate the potential RF pick up on the coax cable as it runs past equipment such as computer within the radio room at lower HF and MF frequencies a simple method of winding RG58 coax onto a Powdered Iron Toroid Core was constructed.
[ Hits: 196 | Votes: 3 | Rating: 6 ]
How to Blow Up Your Balun - In this article, author examine stresses placed on common-mode chokes (aka baluns) as hams use/abuse them, examine the efficiency of simple dipole multi- band antennas and their feed systems. Stressing a Balun.
[ Hits: 389 | Votes: 0 | Rating: 0 ]

A simple NonDirectional Antenna for 10 meter - This article is about a simple vertical end-fed-half-wave wire antenna for 10 meters that can be used in case of restricted space.
[ Hits: 705 | Votes: 2 | Rating: 7 ]

The KC5LDO Vertical Antenna - Antenna for Field Day or Everyday. aA simple yet rugged six band quarter wave vertical antenna system perfect for field day or home use.
[ Hits: 185 | Votes: 1 | Rating: 9 ]

70cm Slim Jim antenna - A simple slim jim antenna for 433 MHz. Simple drawings and pictures of a simple Slim Jim antenna.
[ Hits: 267 | Votes: 0 | Rating: 0 ]

Double Quad Antenna for VHF UHF - The structure of this dual band VHF UHF antenna is very simple. It consists of two identical square loops, whose sides measure a quarter wave, connected together at the ends. A project by I5NZR
[ Hits: 247 | Votes: 6 | Rating: 6.33 ]

5 Band Pipe Vertical Antenna - A simple, cheap and easy to build 26 feet long vertical antenna that works DX on 20 - 10 meters including WARC Bands, it is designed for portability for field days, camping, or permanent installation, cost, and to achieve at least 1/2 wavelength on the WARC bands.
[ Hits: 555 | Votes: 5 | Rating: 6.2 ]

Icom 706MkIIG Frequency Calibration - Unlike older radios, the 706 uses only one crystal oscillator (called the Master Oscillator). All other frequencies in the radio (L.O., 3-4 I.F. stages, VFO, and CW-offset) are computer-derived from the Master Oscillator. This makes it relatively simple to frequency-align the radio, so that it agrees with the Frequency Display in all modes.
[ Hits: 214 | Votes: 2 | Rating: 9 ]

SimpleSat Rotor Controller - his controller uses the Yaesu GS-232 command set to control a Yaesu G-5500 Az-El rotor. The controller was designed to be compatible with the SatPC32 tracking program and should work with any tracking program that supports the Yaesu GS-232 format. This controller has been tested with the Arduino UNO and the Arduino Mega2560.
[ Hits: 243 | Votes: 3 | Rating: 7.33 ]

Simple 2.4 GHz SWR Meter - This is a simple 2.4 GHz SWR meter which is based around surplus microwave hardware which can be easily found. The main component is a MECA -20/-20 dB Directional Coupler which has a frequency range of approximately 700 MHz to 2.5 GHz.
[ Hits: 144 | Votes: 2 | Rating: 6 ]

SDR Receiver with RTL-SDR and Gnu Radio - This project is a Software Defined Radio Receiver. It has a frequency range of 24MHz 1.2GHz. It can demodulate AM, FM, USB, LSB with selectable bandwidths of 600, 2400, 2800, 3200 and 6400Hz. Using a simple RTL-SDR Dongle and Raspberry Pi 3 computer using GNU RADIO
[ Hits: 487 | Votes: 1 | Rating: 1 ]

Soundcard Interfacing - The sudden explosion of new digital modes has taken the Amateur Radio world by storm. New modes such as PSK31 FT8 JT65 FSK441, ISCAT as well as established modes such as RTTY, SSTV, Hellschreiber and others have rocketed in popularity. In order to use these modes all that is required is a simple computer-to-radio interface which couples the computer soundcard to the radio
[ Hits: 190 | Votes: 0 | Rating: 0 ]

Specan Spectrum analyzer - The Specan is actually a very simple but robustly built receiver. it is, in essence, a double conversion superhet receiver with 112 Mhz and 12 Mhz Intermediate frequencies. The first mixer uses an Si570 as the local oscillator. The Ardiuno that controls the Specan is a very flexible microcontroller board that you can program in simple C language
[ Hits: 86 | Votes: 1 | Rating: 9 ]

ADF4351 Signal Generator - Just a simple signal generator based on ADF4351 module from fleebay allows you to generate one single frequency that can go up or down in 100Khz steps via two push buttons.
[ Hits: 149 | Votes: 2 | Rating: 10 ]

4m QRP Transverter - There are few equipment for the 4m band, so to get on the band it could be necessary to design and build a simple transverter.
[ Hits: 96 | Votes: 0 | Rating: 0 ]